Linear Integrated Systems
A Leader in Precision Small Signal Discrete Semiconductors
Linear Systems is a designer, manufacturer and seller of precision, high-performance, small-signal discrete semiconductors. A Silicon Valley company founded in 1987, it produces ultra-low-noise, monolithic dual and single JFETs and bipolar transistors, along with high-speed DMOS switches, small-signal MOSFETs, ultra-low leakage diodes and BiFET amplifiers. These parts have been designed into world
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Bidirectional Current Limiter - 28-VAC
This current limiter must be designed with dual JFETs with matched IDSS specifications. During the positive AC cycle, the output diode is turned on which sets the Vgs voltage of the output JFET to -0.7V, turning on this JFET. The output Q2 JFET at this point acts like a current sink drawing current from the Q1 JFET. Similarly, on the negative cycle of the AC waveform, the input diode is turned on and Q1 acts as a current sink and Q2 as the source follower. The resistors are used as discharge paths to discharge the gate capacitance of the JFETs. The diodes when turned on limit the voltage across the associated resistor, however this current is limited to a 0.7V/10K = 0.07mA or 70 µA. The current is limited by the drain to source resistance of the JFET and its IDSS specification value.
The U290 JFET is the circuit below has an on-resistance that is in the order of 2 ohms and it has an IDSS rating of 500mA. This will result in a current limiting value of 500mA. Linear Integrated Systems does not have a JFET switch with these ratings. [BC1] Several JFETs however could be paralleled but it is impractical. The circuit could be adapted but it would have to set much lower limits on current detection. Other JFETs with different IDSS values could be used to limit the current to lower levels.
Visit www.linearsystems.com to browse our industry leading FETs and follow us on LinkedIn so you don’t miss our FET Friday posts!
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Linear Systems on LinkedIn: #linearsystems #fetdesigns #jfet #semiconductorindustry #jfet VFO 2.255 to 2.505MHz 160 Meter This voltage controlled oscillator is designed for improved stability and linearity. Its primary application is in the 160…
07/21/2023
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Linear Systems on LinkedIn: RF Variable Frequency Oscillators There are two types of variable… RF Variable Frequency Oscillators There are two types of variable frequency oscillators. Analog VFOs were traditionally used in radio receivers and…
07/14/2023
Double Balanced Quad Mixer
A quad double balanced mixer is shown below that is similar in operation to diode based mixers. It is built using four JFETs. It consists of four FETs that are fed a local oscillator signal and RF signal through the local oscillator and radio frequency transformers. The local oscillator turns alternating pairs of JFETs on and off. The result of multiplying the oscillator and RF signals together is to produce the sum and difference frequencies for the IF output. The circuit produces very good linearity and associated third order intercept point.
Visit www.linearsystems.com to browse our industry leading FETs and follow us on LinkedIn so you don’t miss our FET Friday posts!
07/07/2023
Double Balanced Mixer IMD 68 dB
The double balanced mixer below is based on dual matched JFET. Designed for high end receivers, it has a third-order intermodulation distortion suppression of 68 dB.
Visit www.linearsystems.com to browse our industry leading FETs and follow us on LinkedIn so you don’t miss our FET Friday posts!
06/30/2023
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Our Story
Linear Integrated Systems (Linear Systems) is a 30 year old, US Based, full service manufacturer of specialty small signal discrete semiconductors. LIS offers over 50 years of design and process experience in JFET and Transistor manufacturing. Our founder and past president Dr. John Hall, had an established track record of leadership within various segments of the semiconductor industry, including the founding of Intersil and Micro Power Systems. We service the Audio, DIY, Hybrid, Medical, Military, Sensor, Space, Test and Measurement markets.
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4042 Clipper Court
Fremont, CA
94538
Opening Hours
| Monday | 7:30am - 4:30pm |
| Tuesday | 7:30am - 4:30pm |
| Wednesday | 7:30am - 4:30pm |
| Thursday | 7:30am - 4:30pm |
| Friday | 7:30am - 4:30pm |
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